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From c1502b0cd16378d6d5bd4259b90bf81a5fb5aad3 Mon Sep 17 00:00:00 2001
From: Claudio Imbrenda <imbrenda@linux.ibm.com>
Date: Fri, 5 May 2023 14:00:51 +0200
Subject: [PATCH 20/21] util/async-teardown: wire up query-command-line-options
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Thomas Huth <thuth@redhat.com>
RH-MergeRequest: 173: Improve memory reclaiming for z15 Secure Execution guests
RH-Bugzilla: 2168500
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Cédric Le Goater <clg@redhat.com>
RH-Commit: [1/2] 76e5f25df2c02721f5a29f552ee3061be589abb2 (thuth/qemu-kvm-cs9)
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2168500
Add new -run-with option with an async-teardown=on|off parameter. It is
visible in the output of query-command-line-options QMP command, so it
can be discovered and used by libvirt.
The option -async-teardown is now redundant, deprecate it.
Reported-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Fixes: c891c24b1a ("os-posix: asynchronous teardown for shutdown on Linux")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-Id: <20230505120051.36605-2-imbrenda@linux.ibm.com>
[thuth: Add curly braces to fix error with GCC 8.5, fix bug in deprecated.rst]
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit 80bd81cadd127c1e2fc784612a52abe392670ba4)
Conflicts:
docs/about/deprecated.rst (missing context from other patches)
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
docs/about/deprecated.rst | 5 +++++
os-posix.c | 14 ++++++++++++++
qemu-options.hx | 34 +++++++++++++++++++++++-----------
util/async-teardown.c | 21 +++++++++++++++++++++
4 files changed, 63 insertions(+), 11 deletions(-)
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 1ca9dc33d6..52893fcf38 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -111,6 +111,11 @@ Use ``-machine acpi=off`` instead.
The HAXM project has been retired (see https://github.com/intel/haxm#status).
Use "whpx" (on Windows) or "hvf" (on macOS) instead.
+``-async-teardown`` (since 8.1)
+'''''''''''''''''''''''''''''''
+
+Use ``-run-with async-teardown=on`` instead.
+
QEMU Machine Protocol (QMP) commands
------------------------------------
diff --git a/os-posix.c b/os-posix.c
index 5adc69f560..90ea71725f 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -36,6 +36,8 @@
#include "qemu/log.h"
#include "sysemu/runstate.h"
#include "qemu/cutils.h"
+#include "qemu/config-file.h"
+#include "qemu/option.h"
#ifdef CONFIG_LINUX
#include <sys/prctl.h>
@@ -152,9 +154,21 @@ int os_parse_cmd_args(int index, const char *optarg)
daemonize = 1;
break;
#if defined(CONFIG_LINUX)
+ /* deprecated */
case QEMU_OPTION_asyncteardown:
init_async_teardown();
break;
+ case QEMU_OPTION_run_with: {
+ QemuOpts *opts = qemu_opts_parse_noisily(qemu_find_opts("run-with"),
+ optarg, false);
+ if (!opts) {
+ exit(1);
+ }
+ if (qemu_opt_get_bool(opts, "async-teardown", false)) {
+ init_async_teardown();
+ }
+ break;
+ }
#endif
default:
return -1;
diff --git a/qemu-options.hx b/qemu-options.hx
index 52b49f1f6a..b18f933703 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4766,20 +4766,32 @@ DEF("qtest-log", HAS_ARG, QEMU_OPTION_qtest_log, "", QEMU_ARCH_ALL)
DEF("async-teardown", 0, QEMU_OPTION_asyncteardown,
"-async-teardown enable asynchronous teardown\n",
QEMU_ARCH_ALL)
-#endif
SRST
``-async-teardown``
- Enable asynchronous teardown. A new process called "cleanup/<QEMU_PID>"
- will be created at startup sharing the address space with the main qemu
- process, using clone. It will wait for the main qemu process to
- terminate completely, and then exit.
- This allows qemu to terminate very quickly even if the guest was
- huge, leaving the teardown of the address space to the cleanup
- process. Since the cleanup process shares the same cgroups as the
- main qemu process, accounting is performed correctly. This only
- works if the cleanup process is not forcefully killed with SIGKILL
- before the main qemu process has terminated completely.
+ This option is deprecated and should no longer be used. The new option
+ ``-run-with async-teardown=on`` is a replacement.
ERST
+DEF("run-with", HAS_ARG, QEMU_OPTION_run_with,
+ "-run-with async-teardown[=on|off]\n"
+ " misc QEMU process lifecycle options\n"
+ " async-teardown=on enables asynchronous teardown\n",
+ QEMU_ARCH_ALL)
+SRST
+``-run-with``
+ Set QEMU process lifecycle options.
+
+ ``async-teardown=on`` enables asynchronous teardown. A new process called
+ "cleanup/<QEMU_PID>" will be created at startup sharing the address
+ space with the main QEMU process, using clone. It will wait for the
+ main QEMU process to terminate completely, and then exit. This allows
+ QEMU to terminate very quickly even if the guest was huge, leaving the
+ teardown of the address space to the cleanup process. Since the cleanup
+ process shares the same cgroups as the main QEMU process, accounting is
+ performed correctly. This only works if the cleanup process is not
+ forcefully killed with SIGKILL before the main QEMU process has
+ terminated completely.
+ERST
+#endif
DEF("msg", HAS_ARG, QEMU_OPTION_msg,
"-msg [timestamp[=on|off]][,guest-name=[on|off]]\n"
diff --git a/util/async-teardown.c b/util/async-teardown.c
index 62cdeb0f20..3ab19c8740 100644
--- a/util/async-teardown.c
+++ b/util/async-teardown.c
@@ -12,6 +12,9 @@
*/
#include "qemu/osdep.h"
+#include "qemu/config-file.h"
+#include "qemu/option.h"
+#include "qemu/module.h"
#include <dirent.h>
#include <sys/prctl.h>
#include <sched.h>
@@ -144,3 +147,21 @@ void init_async_teardown(void)
clone(async_teardown_fn, new_stack_for_clone(), CLONE_VM, NULL);
sigprocmask(SIG_SETMASK, &old_signals, NULL);
}
+
+static QemuOptsList qemu_run_with_opts = {
+ .name = "run-with",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_run_with_opts.head),
+ .desc = {
+ {
+ .name = "async-teardown",
+ .type = QEMU_OPT_BOOL,
+ },
+ { /* end of list */ }
+ },
+};
+
+static void register_teardown(void)
+{
+ qemu_add_opts(&qemu_run_with_opts);
+}
+opts_init(register_teardown);
--
2.39.3
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